US10804985B2ActiveUtilityPatentIndex 94
Electronic device and communication method
Est. expiryMay 17, 2037(~10.9 yrs left)· nominal 20-yr term from priority
H01Q 3/46H04B 7/0456H04B 7/0404H04B 7/0413H01Q 1/246H04B 7/0617H04B 7/04H04B 7/06
94
PatentIndex Score
31
Cited by
12
References
19
Claims
Abstract
The present disclosure relates to an electronic device and communication method. The electronic device comprising a RF link unit radiating a data stream in form of electromagnetic wave radiation onto a phase shifter; a processing circuitry configured to determine an analog precoding matrix; phase shifters, each of which for performing analog precoding on the received signal of the electromagnetic wave radiation according to the determined analog precoding matrix, and an antenna array, each of antenna elements of which transmits the analog precoded signal, wherein the number of the phase shifters is the same as the number of the antenna elements of the antenna array, and the phase shifters and the antenna elements are in one-to-one correspondence.
Claims
exact text as granted — not AI-modifiedWhat is claimed is:
1. An electronic device comprising:
plural radio frequency (RF) link units, each of plural RF links configured to radiate a corresponding data stream in a form of a corresponding electromagnetic wave signal;
processing circuitry configured to determine an analog precoding matrix;
plural phase shifter groups, each phase shifter group having plural phase shifters, each of which for performing analog precoding on a corresponding one of the electromagnetic wave signals according to the determined analog precoding matrix, to generate plural analog-precoded signals,
wherein the analog processing comprises determining a phase change of each of the electromagnetic wave signals upon its arrival at each of the plural antenna elements of the antenna array according to a distance between an electromagnetic wave radiating end corresponding to each data stream and the each of the plural antenna elements as well as a carrier frequency, so as to form a phase change matrix used to generate the plural analog-precoded signals, and
an antenna array having plural antenna groups, each antenna group having plural antenna elements, each of the plural antenna elements configured to transmit a corresponding one of the analog precoded signals,
wherein, for each of the electromagnetic wave signals, a number of the plural phase shifters of a corresponding phase shifter group is the same as a number of the plural antenna elements of a corresponding antenna group, and the plural phase shifters and the plural antenna elements are in one-to-one correspondence.
2. The electronic device according to claim 1 , wherein the processing circuitry is further configured to determine the analog precoding matrix based on a channel matching rule for matching a channel response.
3. The electronic device according to claim 1 , wherein the phase change matrix comprises a phase change matrix F fp , wherein a phase change [F fp ] i,k upon an arrival of a kth radiated electromagnetic wave signal at an ith antenna element of the plural antenna elements of the antenna array is:
[
F
fp
]
i
,
k
=
exp
{
j
·
2
π
[
L
]
i
,
k
λ
}
where j is an imaginary unit, [L] i,k is a distance between an electromagnetic wave radiating end corresponding to the kth data steam and the ith antenna element, and λ is a carrier wavelength of the kth electromagnetic wave signal;
determining the analog precoding matrix according to the phase change matrix F fp and a channel matrix H of a transmitting channel.
4. The electronic device according to claim 3 , wherein the processing circuitry is further configured to calculate the analog precoding matrix based on a least Euclidean distance criteria for channel matching:
Λ
*
=
arg
min
Λ
H
H
-
Λ
Q
F
2
where Q=F fp , Λ* is the optimal solution of the analog precoding matrix Λ, H H is a conjugate transposition matrix of the channel matrix H, and F is a type of norm.
5. The electronic device according to claim 4 , wherein the processing circuitry is further configured to calculate the analog precoding matrix by using a constant modulus constraint based on the antenna array being a passive antenna array, which is radiated partially, from the following equation:
[
Λ
*
]
i
,
i
=
exp
{
-
j
·
∠
(
[
H
H
]
i
,
k
)
}
[
F
fp
]
i
,
k
where [H H ] i,k represents an element in the ith row and the kth column of the matrix H H , k presents an ordinal number of the plural RF link units received by the ith antenna element, and ∠([H H ] i,k ) represents a function argumenting the complex number [H H ] i,k .
6. The electronic device according to claim 4 , wherein the processing circuitry is further configured to calculate the analog precoding matrix by using a constant modulus constraint based on the antenna array being a passive antenna array, which is fully radiated, from the following equation:
[
Λ
*
]
i
,
i
=
h
i
H
q
i
h
i
H
q
i
where h i is the ith column vector of the channel matrix H, and q i is a conjugate transposition of the ith row vector of matrix Q.
7. The electronic device according to claim 4 , wherein the processing circuitry is further configured to calculate the analog precoding matrix based on the antenna array being an active antenna array, which is partially radiated, from the following equation:
[
Λ
*
]
i
,
i
=
exp
{
-
j
·
[
H
H
]
i
,
k
}
[
Q
]
i
,
k
where [H H ] i,k represents an element in the ith row and the kth column of the matrix H H , and k represents an ordinal number of the plural RF link units received by the ith antenna element.
8. The electronic device according to claim 4 , wherein the processing circuitry is further configured to calculate the analog precoding matrix based on the antenna array being an active antenna array, which is fully radiated, from the following equation:
[
Λ
*
]
i
,
i
=
h
i
H
q
i
q
i
H
q
i
where h i is the ith column vector of the channel matrix H, and q i is a conjugate transposition of the ith row vector of matrix Q.
9. The electronic device according to claim 3 , wherein the processing circuitry is further configured to calculate the analog precoding matrix based on a singular value decomposition (SVD) assisted least Euclidean distance criteria for channel matching:
Λ
*
=
arg
min
Λ
H
H
-
Λ
Q
F
2
Where the matrix F fp is SVD decomposed by F fp =USV H , and let Q=US, Λ* is the optimal solution of the analog precoding matrix Λ, H H is a conjugate transposition matrix of the channel matrix H, and F is a type of norm.
10. The electronic device according to claim 1 , wherein the processing circuitry is further configured to determine a digital precoding matrix W, and the electronic device further comprises a digital precoder which digitally precodes each data stream according to the determined digital precoding matrix W and then transmits a resultant digitally precoded data stream to the plural RF link units.
11. The electronic device according to claim 10 , wherein the processing circuitry is further configured to obtain an equivalent channel according to a channel matrix of a transmitting channel, the phase change matrix and the determined analog precoding matrix, so as to determine the digital precoding matrix W.
12. The electronic device according to claim 11 , wherein the processing circuitry is further configured to determine the digital precoding matrix W by considering a global power constraint and using zero-forcing criteria:
w={tilde over (H)} H ( {tilde over (H)}{tilde over (H)} H ) −1 D
Wherein the global power constraint of the digital precoding matrix W is:
∥ ΛFW∥ F 2 =K
Where F fp is the phase change matrix and H is the channel matrix of the transmitting channel, {tilde over (H)}=HΛF fp represents the equivalent channel, and D is a K-order diagonal matrix of transmitting power allocated to the electronic device.
13. The electronic device according to claim 1 , wherein the processing circuitry is further configured such that a number (K) of the data streams, a number N of the plural RF link units and a number M of the plural antenna elements satisfy:
K≤N≤M.
14. The electronic device according to claim 1 , wherein the plural RF link units that are uniformly arranged on a circle facing the antenna array.
15. The electronic device according to claim 14 , wherein a distance f from a center of the circle to a plane of the antenna array satisfies 0.7D≤f≤1.2D, an angle θ between an axis of the circle and a normal line of the plane of the antenna array satisfies θ=0 or 15°≤θ≤25°, the radius r of the circle satisfies d≤r≤0.5D, D is width of the antenna array, and d is an average distance between the plural antenna elements.
16. The electronic device according to claim 1 , wherein the plural phase shifters are included in the antenna array.
17. The electronic device according to claim 1 , wherein the electronic device further comprises amplitude modulation units in one-to-one correspondence to the plural phase shifters, for changing an amplitude of corresponding ones of the electromagnetic wave signals according to the analog precoding matrix.
18. A communication method performed by an electronic device that includes plural radio frequency (RF) link units, processing circuitry, plural phase shifter groups, each phase shifter group having plural phase shifters and an antenna array having plural antenna groups, each antenna group having plural antenna elements, the method comprising:
radiating, by each of the plural RF link units a data stream in a form of a corresponding electromagnetic wave signal;
determining, by the processing circuitry, an analog precoding matrix;
performing analog precoding, by each of the plural phase shifter groups, on a corresponding one of the electromagnetic wave signals according to the determined analog precoding matrix, to generate plural analog-precoded sign,
wherein the analog precoding comprises determining a phase change of each of the electromagnetic wave signals upon its arrival at each of the plural antenna elements of the antenna array according to a distance between an electromagnetic wave radiating end corresponding to each data stream and each of the plural antenna elements as well as a carrier frequency, so as to form a phase change matrix used to generate the plural analog-precoded signals; and
transmitting, by each of the plural antenna groups, a corresponding one of the analog-precoded signals,
wherein, for each of the electromagnetic wave signals a number of the plural phase shifters of a corresponding phase shifter group is the same as a number of the plural antenna elements of a corresponding antenna group, and the plural phase shifters and the plural antenna elements are in one-to-one correspondence.
19. A tangible non-transitory computer readable storage medium storing instructions thereon for implementing the communication method according to claim 18 when loaded and executed by a processor.Cited by (0)
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